CN218274636U

CN218274636U - Negative pole piece, battery core and secondary battery

Info

Publication number: CN218274636U
Application number: CN202222351401.4U
Authority: CN
Inventors: 杨从强
Original assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2022-09-05
Filing date: 2022-09-05
Publication date: 2023-01-10
Anticipated expiration: 2032-09-05

Abstract

The utility model discloses a negative pole piece, an electric core and a secondary battery, which comprises a negative pole current collector, a negative pole active substance layer and a negative pole lug; wherein the negative electrode tabs comprise a first negative electrode tab and a second negative electrode tab; the first negative pole utmost point ear sets up one side of the negative pole mass flow body, the second negative pole utmost point ear sets up the opposite side of the negative pole mass flow body. The utility model discloses a set up first negative pole utmost point ear and second negative pole utmost point ear respectively in the both sides of negative pole mass flow body for first negative pole utmost point ear is when playing normal electrically conductive effect, and second negative pole utmost point ear can play the radiating action, thereby realizes dispelling the heat fast for the casing with the heat transfer that electric core produced, has not only improved the heat-sinking capability of electric core, simple structure moreover, and the cost increase is few, is favorable to the steady work of electric core, is suitable for popularization and application on a large scale.

Description

Negative pole piece, battery core and secondary battery

Technical Field

The utility model relates to a battery technology field especially relates to a negative pole piece, electric core and secondary battery.

Background

In recent years, with the increasing environmental pollution, the new energy industry is receiving more and more attention. The secondary battery is an important component of an electric vehicle, and the safety performance, energy density, cycle life and other performances of the secondary battery directly affect the popularization and use of the electric vehicle, so that the secondary battery attracts wide attention.

In the manufacturing process of the secondary battery, the manufacture of the battery cell is very important. Because the electric core can be along with thermal production at the charge-discharge in-process, especially have the electric core of quick charge (short for fast charge), the electric current of charge-discharge is big more, and then the production of heat is fast, if the heat does not in time spill this moment, light then can cause electric core to become invalid, then can cause serious safety problems such as thermal runaway etc. seriously.

Therefore, it is necessary to improve the heat dissipation performance of the battery cell.

The above information is given as background information only to aid in understanding the present disclosure, and does not establish or acknowledge whether any of the above is available as prior art to the present disclosure.

SUMMERY OF THE UTILITY MODEL

The utility model provides a negative pole piece, electric core and secondary battery to solve the not enough of prior art.

In order to achieve the above object, the present invention provides the following technical solutions:

in a first aspect, an embodiment of the present invention provides a negative electrode plate, including a negative electrode current collector 11, a negative electrode active material layer 12, and a negative electrode tab 13; wherein the content of the first and second substances,

the anode tab 13 includes a first anode tab 131 and a second anode tab 132;

the first negative electrode tab 131 is disposed on one side of the negative electrode current collector 11, and the second negative electrode tab 132 is disposed on the other side of the negative electrode current collector 11.

Further, in the negative electrode plate, the first negative electrode tab 131 is any one of a single electrode tab, a multi-electrode tab, and a full electrode tab.

The second negative electrode tab 132 is a multi-tab or a full tab.

The anode active material layer 12 is covered on at least one of the two opposite surfaces of the anode current collector 11.

In a second aspect, an embodiment of the present invention provides an electrical core, including negative electrode plate 10, positive electrode plate 20 and set up in positive electrode plate 20 with barrier film 30 between negative electrode plate 10, negative electrode plate 10 is as above-mentioned first aspect negative electrode plate.

Further, in the battery cell, the battery cell is formed by any one of lamination, winding and lamination and winding of the positive electrode pole piece 20, the separator 30 and the negative electrode pole piece 10.

Further, in the battery core, the first negative electrode tab 131 and the second negative electrode tab 132 in the negative electrode tab 10 are not wrapped by the separation film 30.

In a third aspect, an embodiment of the present invention provides a secondary battery, including a battery cell and a casing 40 accommodating the battery cell, where the battery cell is the battery cell according to the second aspect.

Further, in the secondary battery, the case 40 is a steel case;

and a second negative pole tab 132 in the battery core is connected with the steel shell.

Further, in the secondary battery, the case 40 is an aluminum case;

and a second negative electrode tab 132 in the battery cell is connected with the aluminum shell through a heat-conducting insulating glue 50.

Compared with the prior art, the embodiment of the utility model provides a following beneficial effect has:

the embodiment of the utility model provides a pair of negative pole piece, electric core and secondary battery, both sides through at the negative current collector set up first negative pole utmost point ear and second negative pole utmost point ear respectively, make first negative pole utmost point ear when playing normal electrically conductive effect, second negative pole utmost point ear can play the radiating action, thereby realize dispelling the heat fast for the casing with the heat transfer that electric core produced, the heat-sinking capability of electric core has not only been improved, and simple structure, the cost increase is few, be favorable to the steady work of electric core, be suitable for popularization and application on a large scale.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a conventional negative electrode sheet mentioned in the first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a negative electrode plate (multi-tab) according to a first embodiment of the present invention;

fig. 3 is a schematic structural diagram of a negative electrode plate (full tab) according to a first embodiment of the present invention;

fig. 4 is a schematic structural diagram of an electrical core provided in an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an electrical core provided in an embodiment of the present invention;

fig. 6 is a schematic structural diagram of the positive electrode plate mentioned in the second embodiment of the present invention;

fig. 7 is a schematic structural diagram of a secondary battery according to a second embodiment of the present invention;

fig. 8 is a schematic structural diagram of a secondary battery according to an embodiment of the present invention.

Reference numerals:

the structure comprises a negative pole piece 10, a positive pole piece 20, an isolating membrane 30, a shell 40 and heat-conducting insulating glue 50;

a negative electrode current collector 11, a negative electrode active material layer 12, a negative electrode tab 13;

a positive electrode current collector 21, a positive electrode active material layer 22, a positive electrode tab 23;

a first negative electrode tab 131 and a second negative electrode tab 132.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the device or element referred to must have the specific orientation, operate in the specific orientation configuration, and thus, should not be construed as limiting the present invention.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Example one

In view of the above-mentioned drawbacks of the conventional battery cell heat dissipation technology, the applicant of the present invention is based on practical experience and professional knowledge that are abundant over many years in the design and manufacture of such products, and is engaged in the application of theory to actively make research and innovation, so as to hopefully create a technology capable of solving the drawbacks of the conventional technology, so that the battery cell heat dissipation technology has higher practicability. Through continuous research and design, and after repeated trial sample and improvement, the utility model discloses the practical value of utensil is established in the end.

The embodiment of the utility model provides a negative pole piece, including negative current collector 11, negative active material layer 12 and negative pole utmost point ear 13; wherein the content of the first and second substances,

the anode tab 13 includes a first anode tab 131 and a second anode tab 132;

the first negative electrode tab 131 is disposed on one side of the negative current collector 11, and the second negative electrode tab 132 is disposed on the other side of the negative current collector 11.

It should be noted that, in the conventional negative electrode tab 10, only one side of the negative current collector 11 has a negative electrode tab 13, which can be referred to fig. 1, and the negative electrode tab 13 is used to connect the inside and the outside of the battery, so as to draw out the current and generate a loop. In this embodiment, on the basis of the design of the conventional negative electrode tab 10, a negative electrode tab 13 is also formed on the other side of the negative electrode current collector 11. For the sake of good distinction, in this embodiment, the originally existing negative electrode tab 13 on one side of the negative electrode current collector 11 is subdivided into the first negative electrode tab 131, and the originally existing negative electrode tab 13 on the other side of the negative electrode current collector 11 is subdivided into the second negative electrode tab 132. After the second negative electrode tab 132 is added, the negative electrode tabs 13 are disposed on both sides of the negative electrode current collector 11, but the first negative electrode tab 131 still plays the original role, i.e., normal conduction, and the second negative electrode tab 132 plays the role of heat dissipation. The negative current collector 11 is a copper foil, the first negative electrode tab 131 and the second negative electrode tab 132 are also copper foils, the heat conductivity coefficient of the copper foil is high, the heat dissipation capability is good, after the second negative electrode tab 132 is added, the heat dissipation area is increased, and therefore the quick heat dissipation is facilitated, in addition, the heat generated by the battery cell can be transferred to the shell through the second negative electrode tab 132, and therefore the heat dissipation effect is further improved.

In this embodiment, the first negative electrode tab 131 is any one of a single electrode tab, a multi-electrode tab, and a full electrode tab.

It should be noted that the single-pole lug, the multi-pole lug and the full-pole lug are all formed by one side edge of the copper foil, but the single-pole lug and the multi-pole lug are obtained after die cutting is needed, and the full-pole lug does not need die cutting.

In addition, although there are single-lug, multi-lug and full-lug cells on the market, in the current battery design process, the single-lug design is difficult to meet the service performance of the battery, so the current battery mainly uses the multi-lug and full-lug design, that is, the first negative electrode lug 131 playing a conductive role in the embodiment is preferably a multi-lug or a full-lug. The present embodiment is illustrated with a multi-tab as an example, and reference may be made to fig. 2-3.

Referring to fig. 2-3 again, in the present embodiment, the second negative electrode tab 132 is a multi-tab or a full tab.

It is understood that, in fact, the second negative electrode tab 132 may be a multi-tab or a full-tab, or a single-tab, but since the design of the present embodiment is designed to improve the heat dissipation capability of the battery cell, and the heat dissipation effect achieved when the second negative electrode tab 132 is a single-tab is not ideal, it is preferable that the second negative electrode tab 132 is a multi-tab or a full-tab with a larger heat dissipation area.

In addition, specifically adopt many utmost point ears or full utmost point ear, require with concrete heat dissipation and be relevant, do not relate to the utility model discloses a core, the embodiment of the utility model provides a do not further inject this.

In the present embodiment, the anode active material layer 12 is covered on at least one of the two opposite surfaces of the anode current collector 11.

The negative electrode current collector 11 may have one surface covered with the negative electrode active material layer 12, or may have both opposite surfaces covered with the negative electrode active material layer 12.

The thickness of the copper foil used to make the negative current collector 11 in this example is 4-10um, and the copper foil includes rolled copper foil and electrolytic copper foil and modified versions thereof. The graphite material in the negative electrode active material layer 12 includes, but is not limited to, natural graphite, artificial graphite, various coated/modified natural graphite or artificial graphite, for example, graphite, soft carbon, hard carbon, carbon fiber, mesocarbon microbeads, silicon-based material.

Although the terms of the anode pole piece, the anode current collector, the anode active material layer, the anode tab, the first anode tab, the second anode tab, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

The embodiment of the utility model provides a pair of negative pole piece, both sides through at the negative current collector set up first negative pole utmost point ear and second negative pole utmost point ear respectively, thereby make first negative pole utmost point ear when playing normal electrically conductive effect, second negative pole utmost point ear can play the radiating action, thereby realize dispelling the heat fast for the casing with the heat transfer that electric core produced, thereby not only improved the heat-sinking capability of electric core, moreover, the steam generator is simple in structure, the cost increase is few, be favorable to the steady operation of electric core, be suitable for popularization and application on a large scale.

Example two

Referring to fig. 4 to 5, an embodiment of the present invention provides an electrical core, including a negative electrode plate 10, a positive electrode plate 20, and an isolation film 30 disposed between the positive electrode plate 20 and the negative electrode plate 10, wherein the negative electrode plate 10 is the negative electrode plate according to the first embodiment.

It should be noted that, the present embodiment is only to improve the negative electrode plate 10, so as to improve the heat dissipation capability of the battery cell formed by the negative electrode plate 10, and the positive electrode plate 20 and the isolation film 30 are still consistent with those in the conventional technology, for example, as shown in fig. 6, the positive electrode plate 20 includes a positive electrode current collector 21, a positive electrode active material layer 22, and a positive electrode tab 23, which are not deeply explained herein in view of the fact that these designs are frequently implemented in the prior art and are not the key points of the design of the present solution.

In this embodiment, the battery cell is formed by any one of lamination, winding, lamination and winding of the positive electrode plate 20, the separator 30, and the negative electrode plate 10.

Specifically, the first negative electrode tab 131 and the second negative electrode tab 132 in the negative electrode tab 10 are not wrapped by the separator 30.

After the battery cell is formed again, if the second negative electrode tabs 132 located at the bottom are in a full tab type, the second negative electrode tabs need to be flattened, if the second negative electrode tabs are in a multi-tab type, the second negative electrode tabs need to be flattened, and the thickness of the flattened tabs is 0.5-2mm.

The embodiment of the utility model provides a pair of electric core sets up first negative pole utmost point ear and second negative pole utmost point ear respectively through the both sides at the negative pole mass flow body for first negative pole utmost point ear when playing normal electrically conductive effect, and second negative pole utmost point ear can play the radiating action, thereby realize dispelling the heat fast for the casing with the heat transfer that electric core produced, the heat-sinking capability of electric core has not only been improved, moreover, simple structure, the cost increase is few, be favorable to the steady operation of electric core, be suitable for popularization and application on a large scale.

EXAMPLE III

Referring to fig. 7-8, an embodiment of the present invention provides a secondary battery, which includes a battery cell and a casing 40 accommodating the battery cell, where the battery cell is the battery cell according to the first embodiment.

In this embodiment, on the one hand, the housing 40 may be a steel shell;

correspondingly, a second negative electrode tab 132 in the battery cell is connected with the steel shell, as shown in fig. 7.

On the other hand, the housing 40 may be an aluminum case;

correspondingly, a second negative electrode tab 132 in the battery cell is connected with the aluminum shell through a heat conducting insulating glue 50, as shown in fig. 8.

It should be noted that, the material of the casing 40 on the market at present is two kinds of steel and aluminum, that is, the steel casing and the aluminum casing mentioned above, and both the two kinds of casings 40 of the heat dissipation scheme proposed in this embodiment are applicable, but because the aluminum casing directly contacts with the second negative electrode tab 132, corrosion of the aluminum casing is caused, so when the casing 40 is an aluminum casing, the heat-conducting insulating glue 50 needs to be added between the second negative electrode tab 132 and the aluminum casing, and specifically, a PI glue with good heat conductivity and insulation property may be selected, that is, the second negative electrode tab 132 contacts with the P I glue adhered to the bottom surface of the aluminum casing, so as to indirectly contact with the aluminum casing. Since the steel can is in direct contact with the second negative electrode tab 132 without causing corrosion of the steel can, when the case 40 is a steel can, the steel can is in direct contact with the second negative electrode tab 132.

The secondary battery in the present embodiment may be applied to, but not limited to, electronic devices such as electronic devices, electric vehicles, or power storage systems. The electronic device may be, for example, various computers, mobile phones, display panels, and the like, which use a secondary battery as a driving power source. The electric vehicle may be, for example, an electric vehicle, an electric tricycle, an electric bicycle, or the like that uses a secondary battery as a driving power source. The electric power storage system may be, for example, an electric power storage system that uses a secondary battery as an electric power storage source.

In these electronic devices, the secondary battery may be electrically connected to the electric element to supply electric power to the electric element. Because the rapid charging ability of the secondary battery provided by the application is excellent, the electronic equipment is favorably used in application scenes such as outdoor energy storage, short-time power supply, mobile energy storage and the like, so that the application scenes of the electronic equipment are wider.

The embodiment of the utility model provides a pair of secondary battery, both sides through at the negative current collector set up first negative pole utmost point ear and second negative pole utmost point ear respectively, thereby make first negative pole utmost point ear when playing normal electrically conductive effect, second negative pole utmost point ear can play the radiating action, thereby realize dispelling the heat fast for the casing with the heat transfer that electric core produced, thereby not only improved the heat-sinking capability of electric core, moreover, simple structure, the cost increase is few, be favorable to the steady operation of electric core, be suitable for popularization and application on a large scale.

In conclusion, upon reading the present detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure can be presented by way of example only, and not limitation. Those skilled in the art will appreciate that the present application is intended to cover various reasonable variations, adaptations, and modifications of the embodiments described herein, although not explicitly described herein. Such alterations, improvements, and modifications are intended to be suggested by this application and are within the spirit and scope of the exemplary embodiments of the application.

Furthermore, certain terminology has been used in this application to describe embodiments of the application. For example, "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various portions of this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined as suitable in one or more embodiments of the application.

It should be appreciated that in the foregoing description of embodiments of the present application, various features are grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one feature. This is not to be taken as an exhaustive list, however, and it is well within the skill of the art to extract some of these features as individual embodiments when reading the present application. That is, embodiments in the present application may also be understood as an integration of multiple sub-embodiments. And each sub-embodiment described herein is equally applicable to less than all features of a single foregoing disclosed embodiment.

Each patent, patent application, publication of a patent application, and other material, such as articles, books, descriptions, publications, documents, articles, and the like, cited herein is hereby incorporated by reference. All matters hithertofore set forth herein except as related to any prosecution history, may be inconsistent or conflicting with this document or any prosecution history which may have a limiting effect on the broadest scope of the claims. Now or later associated with this document. For example, if there is any inconsistency or conflict in the description, definition, and/or use of terms associated with any of the included materials with respect to the terms, descriptions, definitions, and/or uses associated with this document, the terms in this document are used.

Finally, it should be understood that the embodiments of the application disclosed herein are illustrative of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Accordingly, the disclosed embodiments are presented by way of example only, and not limitation. Those skilled in the art may implement the present application in alternative configurations according to the embodiments of the present application. Thus, embodiments of the present application are not limited to those precisely described in the application.

Claims

1. The negative pole piece is characterized by comprising a negative pole current collector (11), a negative pole active material layer (12) and a negative pole lug (13); wherein the content of the first and second substances,

the negative electrode tabs (13) comprise a first negative electrode tab (131) and a second negative electrode tab (132);

the first negative pole utmost point ear (131) set up one side of negative pole mass flow body (11), second negative pole utmost point ear (132) set up the opposite side of negative pole mass flow body (11).

2. The negative electrode tab according to claim 1, wherein the first negative electrode tab (131) is any one of a single-pole tab, a multi-tab, and a full-tab.

3. The negative pole piece according to claim 1 or 2, characterized in that the second negative pole tab (132) is a multi-tab or a full tab.

4. The negative electrode tab according to claim 1, wherein the negative active material layer (12) is coated on at least one of opposite surfaces of the negative electrode current collector (11).

5. An electrical core comprising a negative electrode sheet (10), a positive electrode sheet (20) and a separator (30) disposed between the positive electrode sheet (20) and the negative electrode sheet (10), wherein the negative electrode sheet (10) is the negative electrode sheet according to any one of claims 1 to 4.

6. The battery cell of claim 5, wherein the battery cell is formed by any one of lamination, winding and lamination and winding of the positive electrode pole piece (20), the separator (30) and the negative electrode pole piece (10).

7. The cell of claim 5, wherein neither the first negative tab (131) nor the second negative tab (132) of the negative pole pieces (10) is wrapped by the separator film (30).

8. A secondary battery comprising a cell and a casing (40) housing the cell, characterized in that the cell is a cell according to any of claims 5-7.

9. The secondary battery according to claim 8, wherein the case (40) is a steel can;

and a second negative pole lug (132) in the battery cell is connected with the steel shell.

10. The secondary battery according to claim 8, wherein the case (40) is an aluminum case;

and a second negative electrode tab (132) in the battery cell is connected with the aluminum shell through heat-conducting insulating glue (50).